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PICList Thread
'[PIC]: ICD Hardware Error'
2000\12\16@113153 by David Gomez Otero

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hi,

I have made the ICD debugger, and it doesn't work.  I have the board connected to the PC and
it doesn't recognise the Debugger.  
I haven't connected yet the board to the target:  there is no MCU to debug.  Before beginning testing the board
I would like to know if the software from microchip would give an error message in case of having no micro connected to debug (the header pins are not connected to anything). The other possibility is that my board is not working...

by the way, do you know if the circuitry that uses a coll to generate Vpp voltage is always working ??  

thanks

david

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2000\12\16@153330 by Brent Brown

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> hi,
>
> I have made the ICD debugger, and it doesn't work.  I have the
> board connected to the PC and it doesn't recognise the Debugger.
>
> I haven't connected yet the board to the target:  there is no MCU
> to debug.  Before beginning testing the board I would like to know
> if the software from microchip would give an error message in case
> of having no micro connected to debug (the header pins are not
> connected to anything). The other possibility is that my board is
> not working...
>
> by the way, do you know if the circuitry that uses a coll to
> generate Vpp voltage is always working ??
>
>
> thanks
>
> david

Hi david,

If it is the same as the microchip ICD then it needs to get its power
supply from the target. Hope its comething simple like this. From
what I've read here on the PIClist the coil is controlled by the micro
on the ICD to generate Vpp, so quite likely it only produces it when
required. Have fun!

Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/text: 025 334 069
eMail:  .....brent.brownKILLspamspam@spam@clear.net.nz

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2000\12\16@174926 by Randy Glenn

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I think that the ICD draws its power from the target system.

-Randy Glenn

My software never has bugs. It just develops random features.

Randy_Glenn-at-tvo.org - PICxpert-at-home.com
PICxpert-at-yahoo.com - PICxpert-at-picxpert.com
           http://www.picxpert.com/

{Original Message removed}

2000\12\17@140325 by David Gomez Otero

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hi,

I have already powered the board, but it doesn't work.  What I would like to
know is :
in case I want to connect to the board, just select the ICD-MPLAB option and
it gives me an error message, what
hardware problem could be dued to ?  I mean,   maybe it only talks with the
16F876 and it only needs the lines to the MCU, for inicialitzacion.
So if I made a board only with the F876, and the MAX232 it  would connecte
but nothing else.

An other thing,  in may hardware I used a clock of 3.2768MHz whith is
different from the specs, because there is no  clock of  3.6864. could this
be the problem?

I am using a ST323CN instead from the MAX232, and in the datasheet the
schematics on the capacitors are different from the schem of microchip,
which uses the MAX232.  I think tihis is not very important but who knows
:-?

the config word for the PIC16F876 is 2D2F is this correct ?   There is
something that worries me:  when I read the code from the 16F876, I saw that
the code was not continous. There were some jumps in the FLASH (I saw the
0x3FF, which means no programmed or all '1' but I don't think the program
could have 100 of '1' words , isn't that). is this normal ?

the last thing, is: do you know any test to find the errror?

thanks a lot

david

----- Original Message -----
From: Randy Glenn <.....PICxpertKILLspamspam.....HOME.COM>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Saturday, December 16, 2000 11:48 PM
Subject: Re: [PIC]: ICD Hardware Error


> I think that the ICD draws its power from the target system.
>
> -Randy Glenn
>
> My software never has bugs. It just develops random features.
>
> Randy_Glenn-at-tvo.org - PICxpert-at-home.com
>  PICxpert-at-yahoo.com - PICxpert-at-picxpert.com
>             http://www.picxpert.com/
>
> {Original Message removed}

2000\12\18@091540 by Wynn Rostek

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Before beginning testing the board
I would like to know if the software from microchip would give an error
message in case of having no micro connected to debug (the header pins are
not connected to anything).

David,

The MP-ICD gets the power for the debugger from the circuit it connects to,
as well as the clock, so MPLAB will indicated that it can not communicate
with the debugger unless the MPICD is connected to a circuit that is powered
up.

Wynn Rostek

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